Earbud



FIG. 1 is a front perspective view of an earbud showing the claimed design;

FIG. 2 is a rear perspective view thereof;

FIG. 3 is a side perspective view thereof;

FIG. 4 is another rear perspective view thereof;

FIG. 5 is another side perspective view thereof;

FIG. 6 is another rear perspective view thereof;

FIG. 7 is a side view thereof; and,

FIG. 8 is another side view thereof.

The dashed broken lines in the figures show portions of the earbud that form no part of the claimed design. 

CLAIM The ornamental design for an earbud, as shown and described. 